package Day3;

public class DataType{
    public static void main(String[] args) {
        System.out.println("byte类型："+ Byte.SIZE);
        // System.out.print("java 下的byte类："+java.lang.Byte);
        DataType age = new DataType();
        int num = age.setAge();
        System.out.print(num);
    }
    // 变量作用域
    public int setAge() {
        int age = 10;
        age = age + 10;
        return age;
    }
}